Heavy tetraquarks in the relativistic quark model

• Main Authors: Faustov, R. N, Galkin, V. O, Savchenko, E. M
• Format: Journal Article
• Language: English
• Published: 20-04-2021
• Subjects: Physics - High Energy Physics - Experiment; Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.2103.01763

Universe 7 (2021) 4, 94 We give a review of the calculations of the masses of tetraquarks with two
and four heavy quarks in the framework of the relativistic quark model based on
the quasipotential approach and QCD. The diquark-antidiquark picture of heavy
tetraquarks is used. The quasipotentials of the quark-quark and
diquark-antidiquark interactions are constructed similarly to the previous
consideration of mesons and baryons. Diquarks are considered in the colour
triplet state. It is assumed that the diquark and antidiquark interact in the
tetraquark as a whole and the internal structure of the diquarks is taken into
account by the calculated form factor of the diquark-gluon interaction. All
parameters of the model are kept fixed from our previous calculations of meson
and baryon properties. A detailed comparison of the obtained predictions for
heavy tetraquark masses with available experimental data is given. Many
candidates for tetraquarks are found. It is argued that the structures in the
di-$J/\psi$ mass spectrum observed recently by the LHCb Collaboration can be
interpreted as $cc\bar c\bar c$ tetraquarks.